Iptables Firewall Rules

This is a list of some simple firewall rules that can be added to any of our Asterisk servers using iptables.

iptables -P INPUT ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -j ACCEPT
iptables -A INPUT -p udp --dport 922 -j ACCEPT
iptables -A INPUT -p tcp --dport 922 -j ACCEPT
iptables -A INPUT -p udp --dport 5060:5061 -j ACCEPT
iptables -A INPUT -p udp --dport 10000:20000 -j ACCEPT
iptables -A INPUT -p udp -j DROP
iptables -A INPUT -p tcp --syn -j DROP

To view the rules

iptables -L

To make the rules persistent on reboot

service iptables save
  • firewall, rules, iptables, security

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